MEXICO CITY—Mexico’s ruling party declared Claudia Sheinbaum the winner of the presidential election by a “large margin” after polls closed on Sunday, putting her on course to be the country’s first female president.
Pollster Parametria forecast Ms. Sheinbaum winning a landslide 56 percent of the vote, according to their exit polls, with opposition candidate Xochitl Galvez on 30 percent.